基于CDEM颗粒流的三维高速远程滑坡成灾范围分析

doi:10.13722/j.cnki.jrme.2022.0763

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摘要高速远程滑坡是破坏力极强的滑坡灾害，其典型运动特征为失稳后经过碎屑化作用转化为碎屑颗粒流，是一个典型的从连续到非连续的渐进破坏过程。基于连续–非连续单元法(continuous-discontinuous element method，CDEM)，引入颗粒单元法，对发生大位移、大变形的滑体采用离散元进行计算，变形和位移较小的滑床采用有限元进行计算。根据滑坡区域地形地貌数据建立高精度三维地质灾害模型，考虑岩体滑动过程由于摩擦碰撞等造成强度降低这一因素，对其成灾范围展开数值分析。将模拟结果与现场调查数据进行对比分析，计算得到的滑体堆积形态和范围与实际较为符合。根据能量和速度监测数据，对2例高速远程滑坡进行定量分析。

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	牛犇1
	冯春2
	丛俊余3
	孙子正4
	张一鸣1

关键词 ：边坡工程, 连续&ndash, 非连续单元法, 颗粒流, 高速远程滑坡, 成灾范围, 数值模拟

Abstract：The high-speed long-distance landslide is a landslide disaster with extremely strong destructive force. Its typical movement feature is that the landslide mass is transformed into debris particle flow after the instability. It is a typical progressive failure process from continuous to discontinuous. This study is based on the continuous discontinuous element method，and then the particle element method is introduced. The sliding body with large displacement and deformation is calculated by discrete element method，and the sliding bed with small deformation and displacement is calculated by finite element method. A high-precision three-dimensional geological disaster model is established based on the topographic and geomorphologic data of the landslide area. In the calculation process，the strength reduction caused by friction and collision in the sliding process of rock mass is considered，and the disaster range is analyzed numerically. By comparing the simulation results with the field investigation data，it is determined that the calculated accumulation shape and range of the sliding body are in line with the actual situation. Based on the energy and velocity monitoring data，two high-speed remote landslides were quantitatively analyzed.

Key words： slope engineering continuum-discontinuum element method grain flow high-speed remote landslides hazard range numerical simulation

引用本文:

牛犇1，冯春2，丛俊余3，孙子正4，张一鸣1. 基于CDEM颗粒流的三维高速远程滑坡成灾范围分析[J]. 岩石力学与工程学报, 2023, 42(S2): 4018-4027.
NIU Ben1，FENG Chun2，CONG Junyu3，SUN Zizheng4，ZHANG Yiming1. Three-dimensional high-speed remote landslide disaster area analysis based on CDEM particle flow. , 2023, 42(S2): 4018-4027.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0763 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS2/4018

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